Refrigerating apparatus.



F. A. RIDER. REFBIGEBATIN G APPARATUS.

APPLICATION FILED NOV. 9, N08.

Patented May 4, 1909.

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F. A.,RIDER.

' BBFRIGERATIN G APPARATUS.

APPLICATION FILED NQV. 9, 1908. I A

Patented May 4. 1909. 4

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- 1 IVES-SE5 INVENTOR fit FRANK A. RIDER, OF PITTSBURG, PENNSYLVANIA,

- REFRIGERATING APPARATUS.

No..o20,392.

Specification of Letters Patent.

Patented m 4, 1909.

Application filed November 9, 1908. Serial No. 461,764.

To all whom it may concern:

Be it known that I, FRANK A. RIDER, of Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented certain new anduseful Improvements in Refrigerat- Apparatus; and I do hereby declarethe 'wlng to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to improvements in refrigerating ap aratus, andmore particularly t'o means or passing liquid ammonia from thecondensers to the expansion coils.

Experience has demonstrated the advisability of keeping the expansioncoils supplied with liquid ammonia and of feeding the ammonia in bulkfrom the condensers where it is liquefied, to the expansioncoils. Anobject of my present invention is to provide means whereby theliquid-ammonia is passedto the expansion coils as fast as it is producedin the condensers, irrespective of amounts, ressure, temperatures orother externali uence.

A further object is to provide means whereby the unbalanced weight orhead of a column of liquid ammoma is utilized to automatically controlthe operation of a delivery valve and pass accumulated liquid ammoniafrom the condensers to the expansion coils-at the same time holding aclgsuflicient pressure on the condensers to liquefythe ammonia therein.

With these" objects in view the invention consists in certain novelfeatures of construction and combinations of arts as hereinafter setforth and pointed out in the claims.

being shown at the same side 0 In the accompanying drawings, Figure 1are connected by means of a suction pipe 3 with a compressor 4 and thelatter is-connected by means of a ipe 5 (which maybe conveniently termedt e high pressure hot gas p pe) with one end of the condensers V beexplained.

- movable Liquid ammonia leaves the condensers by the tica y orapproximately so in order to give a head. or wei ht of liquid for apurpose hereinafter exp ained, and the liquid ammonia enters theexpansion coils by way of a pipe 7. Between the pipes 6 and 7, my im-eproved valve devices are ocated and the construction and operation ofthe same will now A cylinder or casing 8 is provided in its bottom plate9 with an outlet 10 with which the pipe 7 leading to the expansion coilsis connected; The cylinder 8 is also provided with an'inlet 12 for thereception of the'pipe 6 which conducts liquid ammonia from thecondensers,'the assage of this liquid am monia from the in et 12 to theoutlet 10 with which the pipe 7 communicates being controlled by meansof a valve 13. In constructing this valve the bottom )late 9 ofthecasing is provided'centrally, wit a post 14 made tubular throughout aportion of its length and provided in its walls withperforations 15located at different levels and connecting the interior of the cylinderwith the tubular poring the cylinder by the pipe 6 can pass throughperforations of the post and from the tubular portion of the latter passto the expansion coils by way of the pipe 7. The part of the valveconsists of a tube 16 adapted to telescope over the post 14 and open orclose more or less of the 'erforations 15v according to the position ofsaid tube. Thetube 16 is connected with and moved by a weighted piston17 located in the upper portion of the cylinder or casing 8, and at apoint above this iston, a pipe 18 connects the cylinder with t 1e highpressure side of the apparatus; i e, the hot gas return ipe 5.

- Jhen the Wei ht or head of iquid cntel-ing the cylin er by the pipe 6from the condensers is 'sufiicient to overcome the weight of the piston17, the latter will be caused to rise and the tube 16 correspondpipe 6,a portion of which is disposed veringly moved to uncover more or lessofthe the quid ammonia to the from the condensers as fast as it iscondensed to the expansion coils and maintain the supply of liquidammonia to the latter constant. tendency on the part of the condensersto hq'uefy the gaseous ammonia with sufficient rapidity (which mightoccur if the liquid be permitted to leave the condensers more rapidlythan the pressure exerted by the compressor can force the gaseous am-'n'ipnia througlt'tlie condensers and effect its v I claim as new anddesire to secure byLetters- Patent, is,

eondensati'orrtherein) will be counteracted.

by the pressure of ammonia gas entering the cylinder 8 by way of thepipe 18,the ressure thus created within the cylinder a ove the Weighted.piston 17 causing the latter to descend against the now diminished headof the column of liquid ammonia entering said cylinder by way of thepipe 6 and cansing'the tube 16 of the valve 13 to descend and cover moreor less of the perforations 15 of post 14 and thus retard'or completelyclose the passage of liquid ammonia from the condensers to the expansioncoils.

From the above it will be observed that my improvements utilize theunbalanced weight of a column of liquid ammonia to operate a deliveryvalve and pass accumulated liquid,-serving also to hold back enoughressure on the condensers to effect the liquef yin of the ammonia inthem. It will also be 0 served that the liquid ammonia will be passed tothe expansion coils as fast as it is produced in the condensers,irrespective of pressure, temperature or other external inuence. 1

Having fully described my invention what 1. In refrigerating apparatus,the combination with a condenser and an expansion coil, of means forutilizing the head or weight of liquid ammonia leaving the con denser tocontrol the passage of said liquid ammonia from the condenser to theexpan sion coil.

2. In refrigerating apparatus, the conib'i-Q nation with a condenser, anexpansion coil, and means for forcing gaseous ammonia from the exan'sion coil to the condenser, of means c'ontro led by the heador'weight of liquid ammonia leaving the condenser, for passing saidliquid ammonia to the expansion coil as fast as it is roduced in thecondenser.

3. In re igerating apparatus, the combination with a condenser, anexpansion coil, a .55

compressor, a connection between the expansion coil and com ressorfand'a connection between the con enser and compressor, of a cylinder, -avalve therein, connections between said cylinder and condenser andbetween said'cylin'der and expansion coil,

1 pn'piston in said cylinder at one side of the ct and outlet for liu'id ammonia for op erating said valve, an a pipe communicating with thecylinder at the other side of said piston and connected with the thecompressor and condenser.

4. In refrigerating apparatus, the combination with a condenser, anexpansion coil, a compressor and connections between the expansion coiland compressor and between the compressor and condenser, of a pipe com-'municating with the condenser for the pasof an outlet pi e for liquidammonia communicating wit the condenser, an inlet pi e pipe between forliquid ammonia communicating with t e expansion coil, a cylindercommunicating with said inlet and outlet, pipes, a valve said cylinderfgr controlling the passage of liquid 311111101118 from the outlet pipeof the condenser to the'inlet pipe of the expansion coil, a weightedpiston connected with said valve, and a pipe connected with the cylindernear ,the end thereof farthest removedfrom the valve, said pipe beingalso connected with the-pipe whic pressor with the condenser.

6. In refrigerating apparatus, the combination'with a condenser, anexpansion coil, a

compressor connected with the outlet of the expansion coil, and a pipeconnecting the compressor with the inlet of the condenser,

an outlet pipe for the condenser, and an inlet pipe for the ex ansioncoil, of means for utilizing an unba anced column of liquid ammonia tocontrol the passage of liquid ammonia from the condenser to the 'exansion coil, said means comprising a cylin er connected with said liquidammonia inlet and outlet pipes, a perforated tubular post within saidcylinder between said inlet and outlet pipe connection, a tube totelescope with said post, a weighted piston within said cylinder and-caring said tube, and a connection between t e cylinder at a point abovethe weighted piston and the ammonia gas pipe which connects thecompressor with the condenser. I

In testimony whereof, I havesigned this Specification in the presence oftwo subscribing Witnesses.

FRANK A. RIDER. Witnesses:

A. H. EAMES, J. WILLIAM MELvILLE.

connects the com.-

